Junaid Saher, Tomko Jan, Semtsiv Mykhaylo P, Kischkat Jan, Masselink W Ted, Pedersen Christian, Tidemand-Lichtenberg Peter
Opt Express. 2018 Feb 5;26(3):2203-2211. doi: 10.1364/OE.26.002203.
Mid-infrared hyperspectral imaging has in the past decade emerged as a promising tool for medical diagnostics. In this work, nonlinear frequency upconversion based hyperspectral imaging in the 6 to 8 µm spectral range is presented for the first time, using both broadband globar and narrowband quantum cascade laser illumination. AgGaS is used as the nonlinear medium for sum frequency generation using a 1064 nm mixing laser. Angular scanning of the nonlinear crystal provides broad spectral coverage at every spatial position in the image. This study demonstrates the retrieval of series of monochromatic images acquired by a silicon based CCD camera, using both broadband and narrowband illumination and a comparison is made between the two illumination sources for hyperspectral imaging.
在过去十年中，中红外高光谱成像已成为一种很有前景的医学诊断工具。在这项工作中，首次展示了基于非线性频率上转换的6至8微米光谱范围内的高光谱成像，使用了宽带球形光源和窄带量子级联激光照明。采用1064纳米混合激光，将AgGaS用作和频产生的非线性介质。非线性晶体的角度扫描可在图像的每个空间位置提供广泛的光谱覆盖。本研究展示了利用宽带和窄带照明，通过基于硅的电荷耦合器件（CCD）相机获取一系列单色图像，并对两种照明源用于高光谱成像进行了比较。
